Upgrade to Webpack 4 (including webpack-dev-server). Add ES6 support via Babel 7.

webpack/base.js

@@ -0,0 +1,48 @@
+const webpack = require("webpack");
+const path = require("path");
+const HtmlWebpackPlugin = require("html-webpack-plugin");
+const CleanWebpackPlugin = require("clean-webpack-plugin");
+
+module.exports = {
+  mode: "development",
+  devtool: "eval-source-map",
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        use: {
+          loader: "babel-loader"
+        }
+      },
+      {
+        test: [/\.vert$/, /\.frag$/],
+        use: "raw-loader"
+      },
+      {
+        test: /\.(gif|png|jpe?g|svg|xml)$/i,
+        use: [
+          "file-loader",
+          {
+            loader: "image-webpack-loader",
+            options: {
+              bypassOnDebug: true
+            }
+          }
+        ]
+      }
+    ]
+  },
+  plugins: [
+    new CleanWebpackPlugin(["dist"], {
+      root: path.resolve(__dirname, "../")
+    }),
+    new webpack.DefinePlugin({
+      CANVAS_RENDERER: JSON.stringify(true),
+      WEBGL_RENDERER: JSON.stringify(true)
+    }),
+    new HtmlWebpackPlugin({
+      template: "./index.html"
+    })
+  ]
+};

webpack/prod.js

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+const merge = require("webpack-merge");
+const path = require("path");
+const base = require("./base");
+const TerserPlugin = require("terser-webpack-plugin");
+
+module.exports = merge(base, {
+  mode: "production",
+  output: {
+    filename: "bundle.min.js"
+  },
+  devtool: false,
+  optimization: {
+    minimizer: [
+      new TerserPlugin({
+        terserOptions: {
+          output: {
+            comments: false
+          }
+        }
+      })
+    ]
+  }
+});